diff --git a/resources/leiningen/new/simple_web_app/project.clj b/resources/leiningen/new/simple_web_app/project.clj
index 15f1845..0163112 100644
--- a/resources/leiningen/new/simple_web_app/project.clj
+++ b/resources/leiningen/new/simple_web_app/project.clj
@@ -1,21 +1,21 @@
 (defproject {{name}} "0.1.0-SNAPSHOT"
 
-  :dependencies [[cljsjs/bootstrap "3.3.6-1"]
-                 [compojure "1.6.0"]
-                 [environ "1.1.0"]
+  :dependencies [[cljsjs/react "17.0.2-0"]
+                 [cljsjs/react-dom "17.0.2-0"]
+                 [compojure "1.6.2"]
+                 [environ "1.2.0"]
                  [hiccup "1.0.5"]
-                 [org.clojure/clojure "1.8.0"]
-                 [org.clojure/clojurescript "1.9.908"]
-                 [org.immutant/web "2.1.9"]
-                 [org.webjars/bootstrap "3.3.6"]
-                 [reagent "0.7.0"]
-                 [ring "1.6.2"]
+                 [org.clojure/clojure "1.10.3"]
+                 [org.clojure/clojurescript "1.10.866"]
+                 [http-kit "2.5.3"]
+                 [reagent "1.1.0"]
+                 [ring "1.9.3"]
                  [ring-webjars "0.2.0"]
-                 [ring/ring-defaults "0.3.1" :exclusions [javax.servlet/servlet-api]]]
+                 [ring/ring-defaults "0.3.2" :exclusions [javax.servlet/servlet-api]]]
 
-  :plugins       [[lein-cljsbuild "1.1.7"]
-                  [lein-environ "1.1.0"]
-                  [lein-figwheel "0.5.13"]]
+  :plugins       [[lein-cljsbuild "1.1.8"]
+                  [lein-environ "1.2.0"]
+                  [lein-figwheel "0.5.20"]]
 
   :main          {{root-ns}}.server
 
@@ -39,11 +39,11 @@
 
   :profiles      {:dev     {:env          {:dev? true}
                             :source-paths ["env/dev/src"]
-                            :dependencies [[figwheel-sidecar "0.5.13"]
-                                           [org.clojure/tools.nrepl "0.2.13"]
-                                           [com.cemerick/piggieback "0.2.2"]]
-                            :figwheel     {:nrepl-port       7000
-                                           :nrepl-middleware [cemerick.piggieback/wrap-cljs-repl]}
+                            :dependencies [[figwheel-sidecar "0.5.20"]
+                                           [nrepl "0.8.3"]
+                                           [cider/piggieback "0.5.2"]]
+                            :repl-options {:nrepl-middleware [cider.piggieback/wrap-cljs-repl]}
+                            :figwheel     {:nrepl-port 7000}
                             :cljsbuild    {:builds {:app
                                                     {:source-paths ["src" "env/dev/src"]}}}}
 
diff --git a/resources/leiningen/new/simple_web_app/src/root_ns/client.cljs b/resources/leiningen/new/simple_web_app/src/root_ns/client.cljs
index 88a906e..04f396e 100644
--- a/resources/leiningen/new/simple_web_app/src/root_ns/client.cljs
+++ b/resources/leiningen/new/simple_web_app/src/root_ns/client.cljs
@@ -1,14 +1,16 @@
 (ns {{root-ns}}.client
   (:require
-    [reagent.core :as r]))
+    [reagent.dom :as rd]))
 
 (defn main-app-component
   []
-  [:h1 "Hello, world!"])
+  [:div
+   [:h1 "Hello, world!"]
+   [:p "This is my Clojure web app."]])
 
 (defn reload
   []
-  (r/render-component [main-app-component] (.getElementById js/document "app")))
+  (rd/render [main-app-component] (.getElementById js/document "app")))
 
 (defn ^:export run
   []
diff --git a/resources/leiningen/new/simple_web_app/src/root_ns/server.clj b/resources/leiningen/new/simple_web_app/src/root_ns/server.clj
index 6a143fc..c4489c0 100644
--- a/resources/leiningen/new/simple_web_app/src/root_ns/server.clj
+++ b/resources/leiningen/new/simple_web_app/src/root_ns/server.clj
@@ -6,12 +6,14 @@
     [environ.core :refer [env]]
     [hiccup.element :refer [javascript-tag]]
     [hiccup.page :refer [html5 include-css include-js]]
-    [immutant.web :as immutant]
+    [org.httpkit.server :as httpkit]
     [ring.middleware.defaults :refer [wrap-defaults site-defaults]]
     [ring.middleware.reload :refer [wrap-reload]]
     [ring.middleware.webjars :refer [wrap-webjars]]
     [ring.util.response :refer [response]]))
 
+(defonce http-server (atom nil))
+
 (defn render-home-page
   []
   (html5
@@ -20,7 +22,6 @@
      [:meta {:http-equiv "X-UA-Compatible" :content "IE-edge"}]
      [:meta {:name "viewport" :content "width=device-width, initial-scale=1"}]
      [:title "{{name}} :: Home Page"]
-     (include-css "/assets/bootstrap/css/bootstrap.min.css")
      (include-css "css/app.css")
      (include-js "cljs/app.js")]
     [:body
@@ -33,15 +34,26 @@
     (route/not-found "not found")))
 
 (def handler
-  (as-> app-routes h
+  (as-> #'app-routes h
         (if (:dev? env) (wrap-reload h) h)
         (wrap-defaults h (assoc-in site-defaults [:security :anti-forgery] false))
         (wrap-webjars h)))
 
-(defn run-server
+(defn stop-server!
   []
-  (immutant/run handler {:port 8080}))
+  (when-not (nil? @http-server)
+    (println "http-kit server stopping ...")
+    (httpkit/server-stop! @http-server)
+    (reset! http-server nil)))
+
+(defn start-server!
+  []
+  (let [config {:port                 8080
+                :legacy-return-value? false}]
+    (reset! http-server (httpkit/run-server #'handler config))
+    (println "http-kit server status:" (httpkit/server-status @http-server) " port:" (httpkit/server-port @http-server))
+    @http-server))
 
 (defn -main
   [& args]
-  (run-server))
+  (start-server!))